Add, subtract, multiply and divide brackets in the following formula to make the equation true 9 9 9 9 9＝19

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• 1. Add, subtract, multiply, divide and parentheses to make the equation true 4 4 4 4=0 4 4 4 4=1 4 4 4 4= 5 4 4 4 4= 9 4 4 4 4=24 4 4 4 4=24 4 4 4 4=28 4 4 4 4=68
• 2. Calculation 1-2 + 3-4 + 5-6 +... - 2004 + 3005=
• 3. （1-1/2）*（1+1/2）*（1-1/3）*（1+1/3）*（1-1/4）*（1+1/4）*.*（1+1/2004）*（1-1/2004）
• 4. 15 cubic meters = () liter is equal to () milliliter one and three molecule one hour = () minute 13000 square meters = () hectare
• 5. 3 hours 45 minutes = () hours, 8200 ml = () hours, 1.6 square kilometers = () liters () ml
• 6. Please judge the square of a - 2A + 3 and - 2A + 3
• 7. If real numbers a, B and C satisfy a ^ 2 + B ^ 2 + C ^ x = 667, then the maximum value of algebraic formula (a-b) ^ 2 + (B-C) ^ 2 + (C-A) ^ 2 is
• 8. A new operation is defined: A & B = A / 2 + B / 4, 3 & B = 4, B =?
• 9. Let the solution set of inequality x2-2ax + A + 2 ≤ 0 be m. if M ⊆ [1,4], then the range of real number a is______ ．
• 10. A new operation "⊕" is defined for any rational number x and y as follows: X ⊕ y = x2-y. if | A-3 | + (B + 2) 2 = 0, then a ⊕ B=___ ．
• 11. Add brackets where appropriate to make the equation true 1+2*3+4*5+6*7+8*9=505 (Note: * "is a multiply sign)
• 12. Add brackets where appropriate in the following formula to make the equation hold. 8 + 36 / 4-2 * 5-1 = 109
• 13. Add brackets where appropriate in the following formula to make the equation hold. 6 + 36 △ 3-2 × 4-1 = 8 It's so hard
• 14. The maximum result is ()
• 15. 1 / 2 / 3 / 4 / 5 / 6, add a bracket in the formula to maximize the result What's the biggest one?
• 16. If the sum of the formulas of two nonnegative numbers is 0 (or the two formulas are opposite to each other), then the two formulas are equal to - ---, that is, the nonnegative conditional formula
• 17. What is the coefficient of the square of a minus two times B, and how many times is it
• 18. Square / 3 coefficient of 2 * 3.14 * H: Times:
• 19. A square with a side length of 10 cm has an area of () A. 1 square meter B. 1 square decimeter C. 1 square centimeter
• 20. A square with a side length of () has an area of 1 square decimeter. A square with an area of () has a side length of 1cm